655430251 has 16 divisors (see below), whose sum is σ = 789384960. Its totient is φ = 531623520.

The previous prime is 655430239. The next prime is 655430263. The reversal of 655430251 is 152034556.

It is an interprime number because it is at equal distance from previous prime (655430239) and next prime (655430263).

It is a cyclic number.

It is not a de Polignac number, because 655430251 - 2⁹ = 655429739 is a prime.

It is not an unprimeable number, because it can be changed into a prime (655430221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142845 + ... + 147361.

It is an arithmetic number, because the mean of its divisors is an integer number (49336560).

Almost surely, 2^655430251 is an apocalyptic number.

655430251 is a deficient number, since it is larger than the sum of its proper divisors (133954709).

655430251 is a wasteful number, since it uses less digits than its factorization.

655430251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5634.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 655430251 is about 25601.3720530756. The cubic root of 655430251 is about 868.6446730751.

The spelling of 655430251 in words is "six hundred fifty-five million, four hundred thirty thousand, two hundred fifty-one".